本研究主要為利用桑克（Sagnac）與馬赫-詹德（Mach-Zehnder）混合式干涉儀發展布拉格光纖光柵感測器（Fiber Bragg Grating Sensor），用於土石流地聲之監測，感測器為參考前人發表應用光纖光柵感測器量測加速度之文獻，加以改良設計而成，其構型分別為三明治型光纖光柵感測器、雙樑型光纖光柵感測器以及懸臂樑型光纖光柵感測器。試驗方法為利用干涉光路系統搭配感測器於實驗室進行石頭撞擊礫石底床之測試，並與目前用來量測土石流地聲之地聲檢知器（Geophone）做比較。待實驗室測試分析結果證實可行後，擇ㄧ現地土石流觀測站進行現地試驗，本研究之現地測試位於南投縣神木土石流觀測站愛玉子溪之河床。由於現地組成粒子較為複雜，因此所測得地聲頻域較廣，由試驗結果可知光纖光柵感測器有效量測地聲訊號，並比對三種構型感測器與地聲檢知器結果，顯示三明治型光纖光柵感測器感測性能最好。最後，實驗結果顯示光纖光柵感測器與地聲檢知器的量測結果具有高度的一致性，足見光纖光柵感測器可應用在土石流地聲監測上。

The purpose of this study is to develop fiber bragg grating sensors based on the Sagnac and Mach-Zehnder hybrid interferometer for detecting ground vibrations generated by debris flows. The development of advanced FBG sensors, including Sandwich FBG sensor, flexural beam FBG sensor, and cantilever beam FBG sensor, refer to the previous construction made for acceleration measurement in literature. The FBG sensors and the fiber optical system were examined with geophone in the laboratory to measure the ground vibration produced by rocks hitting ground. Comparison of measured signals verified the capability of the advanced sensors, and the consistency between FBG sensors and geophone in time and frequency domain. Field experiments were conducted near the main channel of river, where debris flows monitoring system would be deployed. The FBG sensors and the geophone were buried in the ground near Ai-Yu-Zi Creek to measure the ground vibration produced by the rocks striking. The analysis of data acquired by the FBG sensors and a geophone indicated that the frequency range of impact signal measured in field was wider than in the laboratory. Furthermore, measured result from the Sandwich FBG sensor was better than the other sensors. The result of measurement could be as reference for development of monitoring system and applied on detection of debris flow in the future.

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